HMAC-SHA256 Generator
💡HMAC provides integrity/authenticity, not encryption. Requires a shared secret.
HMAC provides message authentication and integrity, not confidentiality.
About HMAC-SHA256
HMAC combines a cryptographic hash function with a secret key to verify message integrity and authenticity. Widely used in API signing and webhooks.
Security Notes
Keep keys secret and rotate as needed. Use hex/base64 consistently for transport. Avoid key reuse across domains.
HMAC-SHA256 generator online free, no upload (FAQs)
FAQs
- What does HMAC guarantee?
- Integrity and authenticity (with a shared secret). Not confidentiality.
- How to sign the correct bytes?
- Define a canonical message format (ordering, encoding) and sign exactly those bytes.
- Does this tool upload my data?
- No. HMAC is computed locally in your browser.